These cartridges did not work initially in my HP Pro 8000 printer. I discovered the chips were installed in the slot all the way to the right, whereas my original cartridges had chips more in the center. I pulled all the chips out and reinstalled them in the center of the slot with double-stick tape, which solved the problem. If just one of them is off, the printer will not recognize any of your cartridges (it will show them as missing).

After you get the chips installed correctly, your printer dialogue box will warn you of "Counterfeit" cartridges. Just click on"Dismiss this message" and all should work fine.